Yamaha YZF-R125 Owners Manual: Ignition circuit cut-off system

The ignition circuit cut-off system (comprising the sidestand switch, clutch switch and neutral switch) has the following functions.

  • It prevents starting when the transmission is in gear and the sidestand is up, but the clutch lever is not pulled.
  • It prevents starting when the transmission is in gear and the clutch lever is pulled, but the sidestand is still down.
  • It cuts the running engine when the transmission is in gear and the sidestand is moved down.

Periodically check the operation of the ignition circuit cut-off system according to the following procedure.


WARNING
If a malfunction is noted, have a Yamaha dealer check the system before riding.

    Sidestand
    The sidestand is located on the left side of the frame. Raise the sidestand or lower it with your foot while holding the vehicle upright. TIP The built-in sidestand switch is part of the ign ...

    For your safety - pre-operation checks
    Inspect your vehicle each time you use it to make sure the vehicle is in safe operating condition. Always follow the inspection and maintenance procedures and schedules described in the Owner's Ma ...

    Other materials:

    Electrical components
    1. Main switch 2. Clutch switch 3. Front brake light switch 4. Ignition coil 5. Throttle body sensor assembly (intake air pressure sensor, intake air temperature sensor, throttle position sensor) 6. FID (fast idle solenoid) 7. Rectifier/regulator 8. Lean angle sensor 9. Starting circui ...

    Identification numbers
    Record the key identification number, vehicle identification number and model label information in the spaces provided below for assistance when ordering spare parts from a Yamaha dealer or for reference in case the vehicle is stolen. KEY IDENTIFICATION NUMBER: VEHICLE IDENTIFICATION ...

    Installing the shift shaft
    1. Install: Stopper lever "1" Stopper lever spring "2" NOTE: Install the stopper lever spring as shown in the illustration. Hook the ends of the stopper lever spring onto the stopper lever and the crankcase boss "3". Mesh the stopper lever with the shift drum segment assembly. ...

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